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arXiv 1003.0077nucl-thhep-phmath-phmath.MPnucl-ex
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热非对称核物质中的粲偶素质量

Charmonium mass in hot asymmetric nuclear matter

Amruta Mishra, Arvind Kumar

摘要:

本文计算了有限温度下同位旋非对称核物质中J/ $ψ$和粲偶素激发态($ψ$(3686)和$ψ$(3770))的介质内质量。这些质量的变化是由于粲偶素态与QCD胶子凝聚体的相互作用而产生的,通过引入标量介子场来模拟,以将QCD的破缺标度不变性纳入有效的手征模型中。在核物质中J/ $ψ$的质量随密度的变化被认为是相当小的,正如文献中通过使用各种方法所示的那样,然而,在高密度下,粲偶素的激发态($ψ$(3686)和$ψ$(3770))的质量被认为有相当大的下降。在热核物质中也研究了粲偶素态的质量对同位旋不对称性的依赖关系,并发现在中等温度和高密度下是明显的。这些粲偶素态的介质修正将修正FAIR GSI未来装置中非对称重离子碰撞中产生的压缩重子物质的实验观测值。

英文摘要:

We calculate the in-medium masses of J/$ψ$ and of the excited states of charmonium ($ψ$(3686) and $ψ$(3770)) in isospin asymmetric nuclear matter at finite temperatures. These mass modifications arise due to the interaction of the charmonium states with the gluon condensates of QCD, simulated by a scalar dilaton field introduced to incorporate the broken scale invariance of QCD within an effective chiral model. The change in the mass of J/$ψ$ in the nuclear matter with density is seen to be rather small, as has been shown in the literature by using various approaches, whereas, the masses of the excited states of charmonium ($ψ$(3686) and $ψ$(3770)) are seen to have considerable drop at high densities. The dependence of the masses of the charmonium states on the isospin asymmetry has also been investigated in the hot nuclear matter and is seen to be appreciable at moderate temperatures and high densities. These medium modifications of the charmonium states should modify the experimental observables arising from the compressed baryonic matter produced in asymmetric heavy ion collision experiments in the future facility of FAIR, GSI.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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